Question

If resultant of two vectors ã and b is root7b,the the value of b/a is​

Answer 1

Answer:

this answer will be helper you like and

Explanation:

= a^2 + b^2 + 2ab cos 60

7b^2 = a^2 + b^2 + ab

6b^2 = a^2 + ab

Dividing both sides by a^ 2 and letting b/a = n

6n^2 = 1 + n

n = 1/2 & -1/3.

b/a = 1/2 & -1/3.

c^2 = a^2 + b^2 - 2abcos(120).

7b^2 = a^2 + b^2 - 2(ab)x 0.5,

6b^2 - a^2 - ab = 0, → 6(b/a)^2 -(b/a) - 1 = 0,

→ (b/a) = (1/6) +/-sqrt(1/36 + 4/6) = (1/6) +/- (5/6), → (b/a) = 1 or -(2/3).

FIITJEE's Big Bang Edge Test 2020.

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